Take those landscaping home improvements [1] around to the front yard, an instant register of perceived home value for every passerby. Then approach the entry with an assessment of its welcome quotient. A beautiful new door with high-tech toughness to withstand the elements is an affordable home improvement that will instantly ratchet up that perceived value, and a few well-placed planters of blooms add freshness and friendliness. Also consider adding a decorative but functional bench to ease the driveway-to-door transition of shopping bags as well as create a sheltered seating area.
Links:
[1] http://www.moneypit.com/article/landscaping-projects-last